Fix representation for CompareIC in JSGenericLowering.

test/mjsunit/regress/regress-3884.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --expose-gc
+
+function f(x) {
+  // TurboFan will hoist the CompareIC for x === 'some_string' and spill it.
+  if (x === 'some_other_string_1' || x === 'some_string') {
+    gc();
+  }
+  if (x === 'some_other_string_2' || x === 'some_string') {
+    gc();
+  }
+  // TurboFan will hoist the CompareIC for x === 1.4 and spill it.
+  if (x === 1.7 || x === 1.4) {
+    gc();
+  }
+  if (x === 1.9 || x === 1.4) {
+    gc();
+  }
+}
+
+%OptimizeFunctionOnNextCall(f);
+
+f('some_other_string_1');
+f(1.7);